MXPA04003634A

MXPA04003634A - Reformed can end and method therefore.

Info

Publication number: MXPA04003634A
Application number: MXPA04003634A
Authority: MX
Inventors: Gopalaswamy Rajes
Original assignee: Rexam Beverage Can Co
Priority date: 2001-10-19
Filing date: 2002-10-08
Publication date: 2005-08-26
Also published as: AU2002347836B2; RU2307053C2; BR0213409A; BR0213409B1; EP1441957B1; RU2004111611A; WO2003035494A1; CN1606521A; CN1326752C; US6748789B2; ES2390121T3; US20030075544A1; NZ532329A; US7748563B2; BR0213409B8; EP1441957A1; US20040211786A1

Abstract

A method for strengthening an end member (10) for a container comprises the steps of providing an end member shell (89) and reforming the end member shell (89). The finished the end member has a central panel wall (12) with a product side and a public side. The public side has a means for opening a frangible panel segment. The end member shell (89) has a central panel (12) extending radially outwardly from a central axis (x, y), a panel radius (102) along a peripheral edge of the central panel (12), a countersink (16) integral with the panel radius (102), a chuckwall (15) extending upwardly from the countersink (16) having a bend (108) with a radius of curvature (Rscwq) and angled axially outwardly, and a seaming curl (14) defining the outer perimeter of the end member shell (89) and integral with the churckwall (15). The chuckwall (15) of the end member shell (89) is reformed to decrease the radius of curvature(Rscwq) of the bend (108).

Description

REFORMED CAN TERMINAL AND METHOD DESCRIPTION TECHNICAL FIELD The present invention relates to terminals for metal containers for beers and beverages that have a non-frangible panel of operation. In particular, the present invention relates to an improvement in the reforming techniques to produce a light terminal.

Antecedents of the Invention The common terminals for beer and beverage containers have a central panel which, in turn, has a frangible panel (sometimes known as an opening panel, cutting panel or pouring panel) defined by a line formed in the external surface, or "consumer side" of the can terminal. In popular ecology the terminals are designed to provide a way to open the terminal by fracturing the metal line of the panel, without allowing the separation of any of the terminal parts. For example, the most common beverage container has a cutting panel that is held at the end by a hinge region without cutting that joins the frangible panel with the rest of the terminal. This type of container is called "stay on" ("SOT"), which has a cutting panel that is defined by an incomplete shape in a circle, with the segment without cut that serves to retain the metal fragment in the cutting line or hinge of the frangible panel displacement. The container is commonly a metal can, commonly constructed of a thin plate of aluminum. The terminals of said containers are constructed of a thin plate of aluminum or steel in a portion of metal and manufactured until the finished product is obtained in a process known as final conversion. These ends are formed in the process of first forming a thin edge metal sheet, which forms a blank end and converting this end in the terminal that can be attached to the container. Although not currently a popular alternative, said containers and / or ends that can be constructed of plastic material with a similar construction of non-separable parts provided for its opening. These types of "stay on" tongue have been used for many years, with a retained tab and a cutting panel of various different types and sizes. Through the use of such terminals, manufacturers have sought cost savings in the metal by thinning the thickness of the terminals and tabs. However, because terminals in containers with pressurized contents are sometimes subject to pasteurization, these conditions cause great stress to the terminal components during pasteurization, transit and during the opening process by the consumer. These conditions limit the reduction of the thickness of the metal of the terminal and make difficult the alteration of the characteristics of said terminal, as for example, the reduction of the thickness of the residual metal in the notch defining the frangible or cutting panel. The pressurized contents of the can cause the lid to inflate. Pressurized contents can also result in a condition where the tongue is forced upward. There is a maximum allowable distance where the tongue can be displaced without the tongue extending outwardly relative to the container. This is called an overlay on a tongue. The tongue overlap leads to problems of abuse when transporting where the frangible panel fractures prematurely during the distribution of already filled cans. By reducing the manufacturers the thickness of the metal used to make the terminals, the auction on tab increasingly becomes a problem. Then the need for a can end with a better ability to resist the roll or a better finish on the tongue.

Brief Description of the Illustrations Fig. 1 is a top view of the can terminal of FIG. 1 with a tongue attached to it; Fig. 2 is a partial cross-sectional view of the terminal member before its formation; Fig. 3 is a partial cross-sectional view of a reformed terminal member; Y Fig. 4 is a partial cross-sectional view of two reformed axially stacked terminal members.

Detailed description Although this invention is susceptible to inclusions of different forms, the preferred inclusions of the invention are illustrated in the illustrations and will be explained herein in detail with the understanding that the present disclosure should be considered as an example of the principles of the invention. and is not intended to limit the broad aspect of the invention to the illustrated inclusions.

The terminal of the present invention is a Stay on 10 tongue with improved physical properties including strength. Essentially, the present invention provides a lightweight can terminal member that includes the physical characteristics and properties required by beverage containers on the market, as explained below. With reference to fig. 1, the can end 10 for a container (not shown), has a central panel wall 12 which has a retaining wall 14 for attaching the wall to the container. The container is commonly made of pressed metal, commonly constructed from a thin plate of aluminum or steel, as in all common beverage and beer containers. The terminals for said containers are also typically constructed of a thin sheet of aluminum or steel, formed in a blank part and manufactured in a terminal by a process referred to as final conversion. In the inclusion shown in the figures, the central panel 12 is joined to the container by means of a holding edge 14 which is joined to a coupling edge of the container. The clamping edge 14 of the can end 10 is interconnected to the central panel 12 by a clamping wall 15 and a countersink 16 which is attached to a central panel 12 by a peripheral edge 18 of the center panel 12. this type of joint used In the industry it is formed in the process of forming the blank part from a thin sheet of metal before the final conversion process. However, other means for attaching the central panel 12 to the container can be employed with the present invention. The outer peripheral edge 18 of the central panel 12 is forged to add strength to the can end 10. The coining is the work of hardening the metal between tools. Metal is commonly compressed between a pair of tools, usually a top tool and a bottom tool. The wall of the central panel 12 has a displaceable frangible panel 20 defined by a frangible notch 22 with an adjacent anti-fracture notch 24 in the frangible panel 20 and a non-frangible segment 26. the hinge segment 26 is generally defined by a line straight between the first end 28 and the second end 30 of the frangible notch 22. the frangible panel 20 of the central panel 12 can be opened, i.e. the frangible notch 22 can be segmented or cut and the frangible panel 20 displaced in a angular orientation relative to the remaining portion of the central panel 12, while the frangible panel 20 remains hingedly connected to the central panel 12 by the hinge segment 26. In this opening operation, the frangible panel 20 is moved in an angular movement to the Open by shifting away from the plane of the panel 12. The frangible notch 22 and the second slot of the anti-fracture notch 24 are formed using the All conventional cutting during final forming, using tools including a public side cut with a knife cutter and a lower (product side) with a surface preparation.

The end member 10 has a tab 44 secured to the central panel 12 by a rivet 46. the tab has a lifting end 48 a central region 50 and a nose portion 52. the lifting side 48 and the nose portion 52 they are usually aligned along the central longitudinal axis passing through the rivet 46. the rivet 46 is formed in the typical manner. The user initiates the opening of the can end 10 by lifting the lifting side or end 48 of the tab 44. This lifts the rivet 46 which causes the cutting slot 22 to fracture in the ventilation region 60 which is located by at least partially within the barriers of the wedge region surrounding the rivet 46. A portion of the nose 52 is pressed against the cutting panel 20., the cutting or fracture zone 22 propagates around the cutting panel 20, preferably in progression from the first end 28 of the groove 22 towards the second end 30 of the groove 22. The frangible cutting groove 22 includes a defined portion for a thick portion of residual. This portion is known as groove revision region 62. Groove revision region 62 causes the fracture propagation of frangible groove 22 to naturally stop when the fracture reaches the point of the anura revision region. 62. this allows the container to be safely ventilated before the fracture of the frangible notch 22 continues. An ornament panel 69 is formed on the public side 34 of the center panel 12. the ornament panel 69 is formed in the center panel 12 by conventional shapes. The decorative panel 69 has an ornament shape or profile 70 which is in turn defined by an internal line radius 72 and an outer radio line 74. The decorative panel 69 may have a bilateral symmetry with respect to the plane defined by axes XX and YY. Adornment profile 70 includes first and second opposing portions 76, 78 joined by a pair of side walls 80a and 80b. The first end or portion 76 includes an appendix 82. the appendix 82 is attached to the side walls 80a, 80b by the first and second arcuate portions 84a, 84b. The appendix 82 lies between the transition region 34 of the frangible notch 22 and the outer peripheral edge 18 of the center panel 12. In accordance with another aspect of the present invention, a method of reforming a can end cover to produce a member terminal 10 described herein is also disclosed. The method is used to produce a light terminal member 10, for example of an aluminum of a thickness of 0.0080 for its connection to an open-ended 202 (2,125 inch) container. The end members 10 employ the multi-stage training method.

With reference to fig. 2, a terminal member cover 89 of a cover press is illustrated and before being reformed in a conversion press. The diameter of the central panel of the roof is a distance designated as DSCP of a central axis that is located at the intersection of the Y-Y and X-X axes (see Figure 1). The countersink 16 of the cover of the end member 89 includes an inner wall 90, a curved segment 92, and an outer wall 94 and is a distance of Dscs from the central axis. The curved segment 92 has a radius of curvature of Rscs and includes an annular base 100 positioned along the horizontal plane containing a baseline 101. the central panel 121 has a height of HSCP above the baseline and generally of approximately 0.058. the inner wall 90 is attached to a cover radio panel 102 along the peripheral edge portion 18 of the central panel 12. The radius of the panel cover 102 is at a distance of DSPR from the central axis and counts with an RSPR radius of curvature the outer wall 94 of the countersink 16 is attached to the clamping wall 15. The clamping wall 15 includes a bending portion 108 creating an angle f of about 24 ° -28 °, preferably between 25 ° - 26 and better still from 25o-28 ° or any combination of ranges in the present. The angle f directed outward from the center panel 12. the fold 108 has a radius of curvature Rscwi between 0.100 and 0.200 inches preferably between 0.130 to 0.170 inches preferably even better is 0.150 inches or any combination range of I presented. The clamping wall 15 includes a second bend having a radius of curvature of Rscw2 of approximately 0.070 inches. The joint edge 14 is located on the outer perimeter of the terminal member 89 at a height of Hems above the base line 101 and has a joint edge height of Hssc which is measured from a lower portion of the joint edge 14 to an upper portion of the joint edge 14. The cover of the terminal member 89 passes through a reforming operation during which the central panel 12, the radius of the panel cover 102 the countersink 16 and the clamping wall 15 are reformed. Figure 3 illustrates the cover member after its reform in the conversion pressure. The reformed terminal member 112 includes a stepped profile along the peripheral portion 18 of the central panel 12. The stepped profile includes a first panel radius 1 14 interconnected to a second panel radius 116. a portion of the first panel radio 1 14 is minted. The first panel radius 114 is attached to an inner wall 90 of the countersink 16 and has a height of HRSI that is approximately 0.070 inches above the baseline 101 and a radius curvature of RRS2 and a height of HRS2 that is approximately 0.088 inches above the baseline 101. The dimensions of the first panel radius 114, the second panel radius 116 and the fold portion 108 are selected to optimize the roll resistance. Winding is the loss or degradation of the ability of the pouring panel to support the internal pressure. In addition to the reform operation, the retaining wall 15 is reformed. In particular, before the reformation, the radius of curvature of the 108 Rscwi bend is approximately 0.150 inches. Subsequent to the reformation, the reformed terminal member 11 has a bend bend radius of 108 Rrcwi DE 0.010-0.080 inches preferably 0.015-0.025 inches and preferably 0.020 inches or any range of combinations in the present. The reformation also increases the distance of Lew between the first and second radius of curvature RRCWI and RRCW2 from approximately 0.108 to 0.125, the second radius of curvature R RCW2 being substantially free of change during the reform reform operation. This reform of the clamping wall 15 increases the angle of the clamping wall f by creating a new angle of d about 20o-28 ° preferably between 25o-26 ° and preferably 26 ° or any range of combinations herein. The reformer also creates a composite radius structure in the countersink 16. prior to reformation, the countersink 16 includes the annular base 100 which has a radius of curvature of Rscs. Subsequent to the reforming operation, the countersink 16 has a radius of curvature Rrcsi and an external radius of curvature of Rrcs2 which is generally smaller than the internal radius of the curvature of RRCS-I. Other dimensions of the tin terminal cover 89 in relation to the reformed can end member 1 1 1 include a DSCP diameter of the center panel cover 12 which is generally greater than the diameter Drcp of the reformed center panel 12. The DPR diameter of the radius panel of the cover is substantially equal to the DRPRI diameter of the reformed terminal member of the first panel radius. The diameter Ds "of the cover 89 of the countersink 16 is generally less than the diameter of the Drcs diameter of the reformed countersink 16. The height HEMS of the terminal member with cover 86 is generally greater than the height of HEMR of the reformed terminal member 1 eleven . The HEMR height of the reformed member 11 is preferably about 0.235 inches. This allows a radius of curvature of R RCWI of the reformed bend of the terminal member 1 1 1. in order to reform the countersink 16 of the cover of the terminal member 89, the cover of the terminal member 89 must be wrapped around the tool in the conversion press. Thus, the terminal member 89 must have a deeper countersink 16 (HEMS being approximately 0.0242 inches) and a panel of less depth than the reformed terminal member 1 1 1. However, the deeper countersink 16 of the cover of terminal 89 causes interference when the covers of the terminal members 86 are stacked. The interference occurs at the point where the bend 108 in the retaining wall 15 meets a lower part of the counter-member 16 terminal 86 stacked up. To eliminate interference, the radius of curvature is increased. In the conversion press, the cover of the terminal member 89 is reformed so that the central panel 12 is forced upwards. The depth of the central panel 12 is decreased from HSCP A H RSL In a subsequent operation, the depth of the central panel is increased to HRS2. The depth of the countersink 16 is decreased from HEMS to HEMR. Thus, the countersinker has a shorter length in the reformed terminal member 1 1 1 to obtain a better bending or crushing strength. Another advantage of the present method illustrated in FIG. 4. The reforming of the first radius of curvature RRCWI displaces the clamping wall 1 5 outwards relative to the central axis. This controls the axial stacking of the first reformed terminal member 130 and the second reformed terminal member 132. Suitable stacking is important for the transportation of the reformed terminal members and the subsequent feeding of the terminal members for connection to the body of the terminal. can already full. During stacking, of the reformed terminal members 130, 132 an approach point 134 is defined by an external bottom position of the second axially stacked member 132, generally the outermost portion of the countersink 16 of the stacked top portion 132, is radially located inward of the retaining wall 15. the approach point 134 as illustrated in FIG. 4 is in an annular focusing segment that is spaced from the clamping wall 5 of the lower stacked end, which is spaced from the clamping wall 15 of the lower stacked end 130 along its annular length. The method for reforming the clamping wall 15 according to the present invention is adapted to move the clamping wall 15 away from the approach point 134. said otherwise, the reformed radius of the curvature RRCWI is adapted to position the clamping wall 15 radially outward from the approach point 134. Thus, the terminal members 130, 132 come into contact along the joint edge 14 and there is no interference generated by the parties Remaining of the terminal members 130, 132 and especially there is no contact of the clamping wall 15 with the external lower portions of the axially stacked member. The approach point 134 is located in a horizontal plane that has a height of HAP on the base line 101. The height of the approach point 134 HAP is generally about the height HRB of the horizontal plane containing at least a portion of the fold 108. The end members 130, 132 are stacked in such a way that the clamping edge 14 of the second member 132 rests on the joint edge 130 of the first terminal member 130. again the interference of the clamping wall 15 and other portions of the terminal members 130, 132 is eliminated during the reforming operation. Although this invention has been described with reference to the referred inclusions, it should be understood by those versed in the art, that various changes can be made as well as equivalents that can be substituted by other elements in the present are to move away from the broader aspects of the invention. invention. Also, it is intended that the broad claims not specify details of the particular inclusions disclosed herein in the best manner contemplated, to perform and carry out the invention and should not be limited to said details.

Claims

CLAIMS WE CLAIMS

1. A method for reinforcing a terminal member for a container, the terminal member has a central panel wall with a product side and a public side, the public side has means for opening a frangible panel segment, the method comprises the steps of: Providing a terminal member cover that includes a central panel extending radially outwardly from a central axis, a panel radius extending along the peripheral edge of the center panel, an integral counterbore with the radius of the panel, a retaining wall extending upwardly from the countersink having a bend with a radius of curvature and at an axial outward angle, a joint edge defining an outer perimeter of the cover of the terminal member and integral with the retaining wall; and a reform of the retaining wall to decrease the radius of curvature.

2. The method of claim 1 including a step of reforming the panel radius to form a stepped portion at the peripheral edge of the central panel, the stepped portion having a first arcuate portion interconnected to the countersink through a second arcuate section.

3. The method of claim 2, wherein a step of wedging the stepped portion is included. The method of claim 1 including a countersink reforming step wherein the countersink includes a first portion having a first radius of curvature and a second portion located axially inwardly from the first portion, the second portion having a radius of curvature. The method of claim 4 wherein the second radius of curvature is greater than the first radius of curvature. The method of claim 1 wherein the cover of the terminal member includes a baseline located in the lower vertical extent of the countersink and the center panel is positioned at the first height above the baseline, and the method that also includes a step to reform the terminal cover to position the central panel at the second height, where the second height is greater than the first height. Summary of the Invention It is the object to provide a method to reinforce the terminal of a container. The terminal has a central panel wall with a product side and a public side. The public side has the means to open a segment of the frangible panel. The method has steps to provide a terminal member cover or cover and a reformed portion of the terminal member cover. The terminal member cover includes a central panel that extends radially outward from a central axis. A panel radius is located along the peripheral edge and a retaining wall that extends upwardly from the countersink wall and has a bend with a radius of curvature that is angled with the clamping wall radially outwardly. . A joint edge defines the outer perimeter of the capped terminal member and is integral with the retaining wall. The reforming step is provided to reform the fold of the retaining wall and decrease the radius of curvature. Another object of the present invention is to provide a terminal member for the container. The terminal member includes a central panel, a first panel radius, a countersink, a clamping wall and a joint edge. The central panel extends radially outward from a central axis. The panel radius is located along a peripheral edge of the central panel and includes a radius of curvature that joins the central panel with the countersink. The countersink is integral with the first panel radius and joins the first panel radius with the clamping wall through a concave annular segment. The retaining wall extends upwardly from the countersink to the joint edge located on the outer perimeter of the terminal member. The terminal member includes a point of approach. The approach point is defined by an external lower position of a second axially stacked terminal member. This lower external position is usually the bottom of the countersink. A fold located in the countersink has a directed angle with a radius of curvature adapted to position the countersink radially outward from the approach point. Other features and advantages of the invention will be apparent from the following specification taken in conjunction with the following descriptions of illustrations.